Topic 2

Question 1

Macro Transport:

Answer 1

Transport of:
- Respiration
- Circulation
Takes place in tubes and vessels (Artheria, veins, urethra)

Question 2

Macro Transport:

Purpouse

Answer 2

Carry necessary materials to the place of the essential biochemical (enzymatic) reactions in the cells.

• These reactions takes place in very small volumes and involves displacements of molecules called MICROTRANSPORT

Question 3

Macro Transport:

Fluids

Answer 3

Assumed that fluids are incompressible
Remains constant in Density
Assumed that there is no frictional forces between segments of a fluid moving with respect to one another

Question 4

Macro Transport:

Density

Answer 4

If a sample of a material has a MASS m and a VOLUME v, the density is given as:

       Mass       =      m δ  =  \_\_\_\_\_\_\_         \_\_\_\_   (In SI units Kg/m^3)
     Volume              v

Question 5

Macro transport:

Density depends on?

Answer 5

Varies with:
TEMPERATURE
PREASSURE

Ecpesialy for gasses (table)

Question 6

Macro transport:

Preassure definition

Answer 6

The preassure of a gass or liquid is the force it exerts per unit area on its surroundings or on the walls of its container

Question 7

Macro transport::

Preassure formula

Answer 7

Pressure is given by:
F
P= ___
A

Question 8

Archimede´s Principle

Deffinition

Answer 8

An object floating or submerged in a fluid experiences an UPPWARD or BOUYANT force due to the fluid

Question 9

Archimede´s Principle

Answer 9

mo = δoV
wo = mog = δogV
B = w0 (Since the segment of the fluid remains at rest)
       - Archimede´s principle
w =  δgV
T + B = w
T = w - B =  δgV -  δgV = ( δ-  δo)gV

Question 10

Flow of fluids

Definition

Answer 10

Quantitative statements about fluid flow

• In terms of flowrate Q
• The volume of a fluid flowing past a point per unit time

Question 11

Flow of fluids

Formula

Answer 11

ΔV
Q = ___
Δt

Question 12

Flow of fluids

Incompressible fluid

Answer 12

• The rate of Q1 at one end of the channel must be the same as Q2.
• The flow rate at the other end: Q1 = Q2
  If all the fluid in the channel is moving with a uniform velocity T

Question 13

Flow of fluids

Formula

Answer 13

(Picture of a tube)
ΔX = Δt * v
Δv = A * Δx = AΔtv, BUT
Δv = QΔt = Q = Av

Question 14

Flowrate

Definition

Answer 14

• Equals the cross sectioned area of the channel times the velocity.
• Channels whose cross section changes from A1-A2:
  Results together with Q1=Q2

Question 15

Flowrate

The equation for continuity

Answer 15

A1 V1 = A2 V2

The product of the Cross sectioned area and the velocity is constant. (If it at some point decrease, v must decrease and visa versa)

Question 16

Flowrate

The average flow of velocity

Answer 16

averageV : A1averageV = A2averageV2

Question 17

Equation of continuity:

Answer 17

For channels whose cross section changes from A1 to A2
Results together with QA=Q2
A1V1=A2V2

Question 18

Streamline flow

Answer 18

Simplest kind of fluid flow
A single streamline
A group of adjacent streamlines
A flow tube